23.
Synapse <ul><li>A synapse occurs where ever the action potential meets the end of the axon </li></ul><ul><li>It needs to propagate across that gap </li></ul><ul><li>It does this through chemical messengers </li></ul>

25.
Synapse <ul><li>When Acetylcholine jumps across the gap, it tells the next neuron to fire it’s action potential and the process continues </li></ul>

26.
Homeostasis Summary <ul><li>Homeostasis is the maintenance of a stable internal state within an organism. </li></ul><ul><li>Organisms must respond and maintain homeostasis in relation to many factors. </li></ul><ul><li>Organisms detect changes in their environment and respond to these changes in a variety of ways. </li></ul><ul><li>These changes may occur at the cellular or organism level. </li></ul>